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Moss inhabiting flea beetles of the West Indies III: Erinaceialtica, a new genus from Hispaniola (Coleoptera, Chrysomelidae, Galerucinae, Alticini)

Abstract Erinaceialtica Konstantinov & Linzmeier, a new genus of moss inhabiting flea beetles, containing seven species from the Dominican Republic and Haiti is described and illustrated. Five species are new (E. gabbysalazarae, E. janestanleyae, E. rickstanleyi (the type species), E. rileyi, and E. thomasi) and two species are transferred from Aedmon: A. albicincta (Blake) and A. hugonis (Blake) comb. nov. The new genus is compared to Aedmon Clark, Apleuraltica Bechyne, Andersonaltica Linzmeier & Konstantinov, Distigmoptera Blake, and Ulrica Scherer. Keys to Erinaceialtica and related genera and to Erinaceialtica species are provided.


Introduction
Moss cushions in the West Indies, and in Hispaniola in particular, continue to reveal previously unknown flea beetles and allow proper classification of already described ones. Specimens that form a foundation of this paper were collected on the island of Hispaniola. The ones that we have collected in 2005,2006, and 2014 were extracted from moss cushions the same way as the other moss-inhabiting flea beetles were (for methods see Linzmeier and Konstantinov 2020). However, it remains unknown if Erinaceialtica albicincta (Blake, 1945) and E. hugonis (Blake, 1943a) collected by Darlington in Haiti and the Dominican Republic, respectively, came from moss cushions, although they both were found at significant altitude where moss is generally available. In addition, it seems that E. rileyi and E. thomasi did not come from moss cushions as well.
There is a chance that they were sifted out of leaf litter as their collectors (C. O'Brien and M. Thomas) sifted leaf litter regularly. Species of a number of flea beetle genera which occur in moss are also known to live in leaf litter [e.g. Andersonaltica Linzmeier & Konstantinov (Konstantinov et al. in press), Benedictus Scherer (Sprecher-Uebersax et al. 2009, Ulrica Scherer (Konstantinov andKonstantinova 2011)]. Even if beetles were picked up in sweep net, that would not be the first example of catching moss living flea beetles with a net [e.g. Menudos chamorrae (Konstantinov and Konstantinova 2011)].
The three species, for which association with moss is established, are the very rare examples of flea beetles that live in moss cushions but have fully developed wings and elytra that are free with fully developed humeral calli. Another example is Distigmoptera borealis Blake, 1943b(Konstantinov et al. 2019. However, ability of Erinaceialtica species to fly have not been verified. As has been noticed previously, having fully developed wings, but shortened metasternites (e.g. Nicaltica Konstantinov et al. 2009) may be an indication that the flight muscles are reduced. Erinaceialtica rickstanleyi has such a metasternite (Fig. 32). Although these beetles have wings (Fig. 2), they probably cannot fly, as in the case of some Neotropical cicindelines (Zerm and Adis 2002).

Material and methods
Dissecting techniques and terminology for most internal and external structures follow Konstantinov (1998). In addition, terminology for adult thoracic structures and ridges follows Lawrence and Slipinski (2013), Lingafelter and Konstantinov (2000), and McHugh et al. (1997). Specimen labels are sited verbatim, according to the format justified previously (Konstantinov 1998, Konstantinov and Lingafelter 2002. Specimen observations were made with a Zeiss Stemi SV11 Apo microscope. Digital photographs of morphological structures were taken with Axio Zoom V16 microscope and AxioCam HRC digital camera attached to it and with AxioCam HRC Zeiss attached to Leitz Diaplan compound microscope. Additional images were taken with Macropod Pro photomacrography system (Macroscopic Solutions, LLC, Tolland, CT).
The beetles are deposited in the following collections: National Museum of Natural History, Smithsonian Institution, Washington, DC (USNM); E. Riley collection (ERPC); and Museo Nacional de Historia Natural, Santo Domingo, Dominican Republic (MHND).
Head. Orbit as wide as transverse diameter of antennal socket with punctures dense, large, their diameter greater than distance between them. Inner margins of eye straight, nearly parallel with each other. Distance between eyes (above antennal sockets) in frontal view much greater than transverse diameter of eye (2.4 times). Supraorbital pore only slightly larger than other punctures, but different color (mostly yellowish). Vertex densely and evenly covered with round, setose punctures placed close together. Antennal sockets situated below middle of eye. Frontal ridge (from dorsal side to frontoclypeal suture) 1.58-1.87 times longer than longitudinal diameter of antennal socket; straight in lateral view; extends to level of antennal calli, does not enter in between them. Sides of frontal ridge between antennal sockets and below straight, parallel to each other. Dorsal side of frontal ridge truncate. Frontal ridge and vertex separated by antennal calli. Frontal ridge dorsally as wide as ventrally. Anterofrontal ridge tall, slopes abruptly towards clypeus. Dorsal side of anterofrontal ridge laterally of frontal ridge even, without visible convexity. Frontal ridge and anterofrontal ridge in frontal view form nearly straight angle with each other. Length (thickness) of anterofrontal ridge less than that of frontal ridge. Sides of head below eyes converging ventrally. Shape of clypeus band like. Anterior margin of labrum emarginate. Labrum with 3 pairs of setae, distributed evenly on both sides.
Head sulci and antennal calli. Midcranial suture absent. Supraorbital, orbital, supracallinal, frontolateral and suprafrontal sulci absent. Midfrontal sulcus well developed, long. Antennal calli and top of frontal ridge meet, not separated from each other. Antennal callus not entering interantennal space. Surface of antennal callus on same level as surface of vertex and frontal ridge. Length of antennal callus about as great or shorter than its width. Antennal grooves between eye and frontal ridge present.
Antenna with 11 antennomeres, apical antennomeres much wider than basal. Color of antennomeres (not counting basal antennomeres being a bit lighter than rest) different. Antennomere 5 white. Antenna not reaching half of elytron. Antennomere 1 shorter than next two antennomeres combined. Antennomere 2 globular, shorter than 3, longer than half of it, about as wide as 1, wider than 3. Antennomere 3 longer than 4. Antennomere 5 as long as 4, longer than or as long as 6. Antennomere 7 much wider than antennomeres 4 and 5 separately. Distal antennomeres robust.
Prothorax. Pronotal surface hairy. Anterolateral callosity ovoid or otherwise rounded. Anterolateral callosity: expansion beyond lateral margin slight, facing anterolaterally. Anterior setiferous pore situated about middle callosity. Anterolateral corners of pronotum projected at about same level as middle of pronotum. Sides of pronotum nearly straight with a slight lobe anterior to middle. Pronotal margins even. Base of pronotum straight, without lateral longitudinal impressions. Antebasal transverse impression on pronotum wide, shallow, poorly differentiated from rest of pronotal surface or absent. Longitudinal impressions anteriorly present in middle. Two bumps with groove between present. Lateral margin of pronotum complete. Numerous setae on lateral margin of pronotum present. Posterolateral callosity situated on corner of posterior and lateral margins. Procoxal cavities closed. Intercoxal prosternal process in lateral view more or less straight or slightly convex, in ventral view generally wide, surface concave, posteriorly much wider than in middle. Sides of intercoxal prosternal process concave, posterior end straight, extends beyond procoxae posteriorly.
Elytra with sides nearly straight, sometimes parallel to each other. Humeral calli well developed. Elytron with basal callus. Transverse impression of elytron posteriad to humeral or basal callus deep. Oblique impression on elytron between humeral and basal calli present. Elytron with punctures arranged in striae, not in grooves. Dorsal surface covered with sparse erect and dense hairs arranged in different directions. Elytra at base wider than base of pronotum. Ridges on elytra absent. Epipleura about as wide as front femur, abruptly narrowing before apex, oblique, directed outwardly, reaches end of side of elytron, but not apex.
Metathorax. Metasternum short, about twice as long as mesosternum, anteriorly projecting forward, but not covering mesosternum, without elevated projection in middle. Posterior end of metasternum slightly swollen. Metathoracic discrimen extends a bit more than half of metasternum length. Metatergite about twice as wide as long, with full set of ridges in middle. Metendosternite with relatively short stem, slightly narrower than arms near base. Arm tendon slightly closer to middle than to arm end. Arm ends lightly sclerotized, simple.
Abdomen. Abdominal ventrites 1 and 2 not fused. Abdominal ventrite 1 slightly longer than ventrites 2 and 3 together. Abdominal ventrite 5 slightly shorter than ventrites 4 and 3 together. First abdominal ventrite between coxae without longitudinal ridges. Apex of first abdominal sternite in female evenly and narrowly rounded. Last visible tergite of female without longitudinal groove in middle.
Legs. Pro-and mesotibiae and femora not sexually dimorphic. Profemur generally cylindrical. Pro-and mesotibial spurs absent. Pro-and mesotibiae without lon-gitudinal ridges. Apical part of middle tibia without obtuse tooth beyond middle, followed by excavation. Metafemur enlarged. Posterior edge of metafemur in males as in females. Metafemoral spring present. Metatibia in dorsal and lateral views straight. Metatibia in cross section around middle more or less cylindrical, dorsally convex. Metatibial apex flattened. Sharp edge present on dorsal side of metatibia laterally, absent medially. Metatibia with transverse ridge above insertion of tarsus. Metatibial spur situated laterally, single, simple, narrow, ending in one tooth, shorter than greatest width of metatibial apex. Metatibia ventrally at apex makes lobe on side of spine. Metatarsomere 1 attached anteriorly of apex. First protarsomere of males about as wide and long as in females. Protarsomere 3 wide, with round sides. Metatarsomere 3 longer than wide, elongate, incision absent. Metatarsomere 4 globose. Claw bifid or appendiculate.
Genitalia. Spermatheca with receptacle and pump without distinct border in between. Receptacle curved, three dimensional, longer than wide or as wide as long. Receptacle about as wide as pump. Pump with flattened end. Duct of spermatheca with coils longer than receptacle or as long as receptacle. Vaginal palpi many times longer than wide. Posterior sclerotization of vaginal palpi elongate, rounded at apex. Tignum narrow anteriorly, widens posteriorly. Median lobe of male genitalia elongate. Median lobe of male genitalia in cross section (about middle) oval or flattened.
Type species. Erinaceialtica rickstanleyi sp. nov. by present designation. Etymology. The name of this genus is a combination of two words. First is a Latin word for hedgehog -Erinacei (genitive, singular, masculine, II declension) as a reference to beetles having highly unusual setae that remind needles of a hedgehog. The second word is Altica, the name of the type genus of the Alticini.
Comparative diagnosis. The first known species of Erinaceialtica have been described in the genus Hadropoda (Blake 1943a(Blake , 1945. However, while describing E. hugonis, Blake (1943a) noticed that this species is substantially different from West Indian congeners "and may eventually be placed in a different genus …" (page 440). She made similar observations two years later describing E. albicincta (Blake, 1945) suggesting that "… together they form a group that stands a little apart in the genus [Hadropoda] and resembles in many ways the species of the North American genus Distigmoptera. H. albicincta closely resembles hugonis but differs in having raised sutural margins and three warts as well as an apical tumidity on each elytron. Its elytral punctation is a little finer and the whole beetle slightly more slender" (page 89).
Classification of monoplatine genera presents significant difficulties, moss and leaf litter inhabiting and associated morphological transformations contribute to it. Nevertheless, we were able to circumscribe some distinct species groups among West Indian species that include already described genera (Aedmon Clark, Andersonaltica Linzmeier & Konstantinov, Apleuraltica Bechyne, Distigmoptera Blake, Menudos Linzmeier & Konstantinov, and Ulrica Scherer) and the one described in this paper. To facilitate their identification, we provide a key below.
Some features of Erinaceialtica that cannot be included in the key, but still worth mentioning are: 1) presence of subtle sexual dimorphism in the general color of the body (small difference in size of dark spots is noticed in E. gabbysalazarae) and width of the head (sexual dimorphism among Menudos species exceeds one that generally occurs in flea beetles); 2) median lobe of the aedeagus differs dramatically between species (in most genera, particularly those occurring in leaf litter or moss, median lobes are very similar and differ only in very subtle features e.g. Andersonaltica); 3) species are very colorful (more so than flea beetles in general), dramatically different in color of the body and appendages as well as in color and direction of the setae on pronotum and elytra; this makes species identification relatively easy based on external characters and makes it possible to identify E. albicincta and E. hugonis based on images of the types (see MCZ citations in the reference section). Pro-and mesotibiae bicolored with wide yellowish band in middle (band may be very vivid (Fig. 1 Basal callus poorly developed, antennae filiform with all antennomeres longer than wide; pygidium exposed ....Menudos Linzmeier & Konstantinov (Fig. 60 Description. Body length 2.27-2.64 mm, width 1.29-1.51 mm. Vertex dark brown, part of head below vertex mostly antennal calli and frons yellowish. Antennomere 11 slightly lighter than 9. Base of pronotum yellowish, apex dark. Sides of pronotum dark. Antebasal pronotal impression shallow, poorly defined. Elytral disc broadly yellow, except triangular spot on side and below scutellum, sides and slope of elytron, two spots at beginning of elytral slope in male and larger spot in female. Elytral apex yellowish, slightly darker than elytral disc. Ventral side of body orange. Base of pro-and mesofemora and middle of pro-and mesotibiae white. Apex of pro-and mesofemora and base and apex of pro-and mesotibiae dark brown. Basal half of metafemora dark, apical lighter. Setae on orbit bright yellow, directed ventrally. Setae on middle of vertex directed towards middle, forming a small "mohawk". Pronotal setae directed posteriorly starting from about middle. Median lobe of aedeagus flattened, nearly straight in lateral view, complex ventrally with deep longitudinal impression from base to apex between two sharp ridges and a lobe in middle of impression; narrow before apex, widening towards it, apex itself ogival in shape. Diagnosis. Erinaceialtica gabbysalazarae has a uniquely shaped median lobe of the aedeagus and unique color and can be easily identified using the key at the end of the paper. Habitat. Erinaceialtica gabbysalazarae was collected at El Cachote forest on a rainy day in moss that was hanging from branches and growing trunks of the trees (Figs 12,  13). Altogether about 5 gallons (= 19 L) of moss was collected in a single pillowcase. Some of it was processed directly with Berlese extraction and some was sifted and then processed with Berlese.    Etymology. The species epithet, gabbysalazarae, is a matronym in honor of Gabby Salazar of Bethesda, Maryland in appreciation for comradery and companionship during collecting trips to the Dominican Republic, which she documented in numerous photos.
Type material examined. Description. Body length 2.92-2.97 mm, width 1.45-1.51 mm. Vertex and part of head below vertex with antennal calli and frons same bright metallic green. Antennomere 11 slightly lighter than 9. Base and sides of pronotum same color as apex, bright metallic green. Antebasal pronotal impression absent. Elytral disc bright metallic green. Some spots on elytron appear black in part because elytral surface darker, in part because it is covered with dark setae. In dorsal view dark spots are: below basal margin lateral to scutellum, on lateral slope near middle, and another spot directly below it towards posterior. Elytra towards apex also appear darker. Ventral side of body dark brown, except last abdominal segment being lighter in color. Base of pro-and mesofemora white. Apex of pro-and mesofemora and most of pro-and mesotibiae dark brown, except small lighter ring around middle tibiae. Metafemora dark, with bronzy shine. Metatibia dark yellow. Setae on orbit and vertex yellow, directed laterally. Setae on middle of vertex short, directed towards middle, not forming a small "mohawk". Pronotal setae directed posteriorly starting from about middle. Second row on punctures on elytral slope longitudinally impressed with setae directed laterally and ventrally from it.
Diagnosis. Erinaceialtica janestanleyae has unique color and can be easily identified using the key at the end of the paper.
Habitat. Erinaceialtica janestanleyae was collected in Zapoten forest (northern slopes of Sierra de Baoruco) in moss that was abundant on the sides of the road, tree trunks and branches (Figs 20, 21). Altogether about 30 gallons (= 114 L) of moss was collected in five pillowcases. Small portion of it was processed directly with Berlese extraction and the rest was sifted and then processed with Berlese. This moss collecting event revealed the largest diversity of flea beetles that included one species of Erinaceialtica, one species of Kiskeya Konstantinov & Chamorro and a species of Andersonaltica (Konstantinov et al. in press).
Etymology. The species epithet, janestanleyae, is a matronym in honor of Jane Stanley of Bethesda, Maryland. We greatly appreciate Jane and her family's friendship and generosity in providing access and encouragement at the Punta Cana Resort, including use of their beautiful home, Casa de los Sueños, near the Ecological Reserve.   Description. Body length 2.59-2.86 mm, width 1.45-1.78 mm. Vertex and part of head below vertex including frons same metallic blue. Antennal calli with a greenish shine. Antennomere 11 slightly lighter than 9. Base and sides of pronotum same color as apex, metallic blue and purple (some specimens have pronotum with greenish tint). Antebasal pronotal impression absent. Elytral disc metallic blue and purple. Some spots on elytron appear black in part because elytral surface darker, in part because it is covered with dark setae, these places also slightly impressed compared to rest of elytron surface. In dorsal view dark spots are: on lateral slope near middle and another spot directly below it towards posterior and one on posterior end. Elytra towards apex also appear darker. Triangular spot lateral to scutellum dark yellow. Ventral side of body dark brown, except last abdominal segment being lighter in color. Base of pro-and mesofemora light yellow. Apex of pro-and mesofemora and most of pro-and mesotibiae dark brown, except lighter poorly defined ring around middle tibiae. Metafemora dark, with bronzy shine. Metatibia dark yellow at base, brown near apex. Setae on orbit and vertex whitish, directed laterally. Setae on middle of vertex short, directed towards middle, not forming a small "mohawk". Pronotal setae directed posteriorly starting from about middle. Second row on punctures on elytral slope longitudinally impressed with setae directed laterally and ventrally from it. Median lobe of aedeagus narrows substantially from middle to apex in ventral view, apex rounded.
Diagnosis. Erinaceialtica rickstanleyi has unique color and can be easily identified using the key at the end of the paper.
Habitat. Erinaceialtica rickstanleyi was collected on the southern slopes of Sierra de Baoruco in the area called Las Abejas. The site is a deep ravine situated at about 1200 m, which descends abruptly from pine forest (Figs 44, 45). Fisher-Meerow and Judd (1989)  Etymology. The species epithet, rickstanleyi, is a patronym in honor of Rick Stanley of Bethesda, Maryland. We greatly appreciate Rick and his family friendship and     generosity in providing access at the Punta Cana Resort, including use of their home, Casa de los Sueños. Rick took part in our numerous collecting trips over the years in Bolivia, Costa Rica, Dominican Republic, and Nicaragua documenting local landscapes, avian-and insect faunas with numerous photos, some of which were used in publications (e.g. Konstantinov et al. 2009 Description. Body length 2.10-2.54 mm, width 1.18-1.40 mm. Vertex and part of head below vertex including frons and antennal calli black with dark greenish to blueish tint. Antennomere 11 slightly lighter than 9. Base of pronotum dark yellow, slightly lighter in color than apex. Antebasal pronotal impression absent. Elytral disc black to dark brown with dark greenish to blueish tint. Some spots on elytron appear black in part because elytral surface darker, in part because it is covered with dark setae. In dorsal view dark spots are: one spot lateral to scutellum, two spots down posteriorly near suture, and two more on posterior slope; one spot on humeral callus, two spots behind each other on lateral slope near middle, and another spot directly below it towards posterior. Elytra laterally and towards apex also appear darker. Ventral side of body dark brown, except last abdominal segment being lighter in color. Pro-and mesofemora and pro-and mesotibiae brown, with slightly lighter area on tibiae. Metafemora dark, with bronzy shine. Metatibia uniformly brown to dark amber in color. Setae on orbit and vertex whitish, denser and more vivid on orbit, directed ventrally. Setae on middle of vertex short, directed towards middle, not forming a small "mohawk". Pronotal setae more erect, directed laterally and posteriorly. Second row on punctures on elytral slope not impressed with setae directed laterally and ventrally from it. Median lobe of aedeagus narrows gradually from middle to apex in ventral view with wide apex.
Diagnosis. Erinaceialtica rileyi has unique color and can be easily identified using the key at the end of the paper.
Habitat. Unknown. Etymology. The species epithet, rileyi, is a patronym in honor of Ed Riley, who contributed greatly to our knowledge of diversity and taxonomy of Chrysomelidae in the United States and the New World in general.
Type material examined. Holotype, male: 1) Dom. Description. Body length 2.37 mm, width 1.24 mm. Vertex and part of head below vertex including frons and antennal calli black without apparent greenish or blueish tint. Antennomere 11 as dark as 9. Pronotum dark brown with base slightly lighter in color than apex. Antebasal pronotal impression very shallow and poorly defined.  Two bumps on pronotum short with even shorter one in between them close to posterior margin. Elytral disc with two long, triangular, dark greenish to blueish metallic tint along suture. Rest of disc posteriorly dark yellow. Elytra laterally and towards apex appear darker. Ventral side of body dark brown to black, except last abdominal segment being lighter in color. Pro-and mesofemora yellow at base, dark brown for rest of its length. Pro-and mesotibiae brown, with slightly lighter area around middle. Metafemora dark, with bronzy shine. Metatibia bicolored, darker at apex, lighter at base. Setae on orbit and vertex as sparse and same color. Setae on middle of vertex short, directed towards middle, not forming a small "mohawk". Pronotal setae directed laterally and posteriorly. Second row on punctures on elytral slope not impressed with setae directed laterally and ventrally from it. Median lobe of aedeagus narrows extensively from middle to apex, apex more or less cylindrical in ventral view. In lateral view, median lobe bends abruptly ventrally.
Diagnosis. Erinaceialtica rileyi has unique color and can be easily identified using the key at the end of the paper.
Habitat. Unknown. Etymology. The species epithet, thomasi, is a patronym in honor of late Mike Thomas, who contributed greatly to our knowledge of beetle diversity, taxonomy, and identification in the United States. Elytron unicolorous, without broad, brownish oblique stripe starting from around humeral calli and extending towards suture and below (Fig. 15) .....5 3(2) Elytron with broad yellowish stripe. Dark colored part of elytron with bright metallic green lustre (Fig. 4). Median lobe of aedeagus with apical part wider than middle (Fig. 6)  Median lobe of aedeagus narrows extensively from middle to apex, apex more or less cylindrical in ventral view. In lateral view, median lobe bends abruptly ventrally (Fig. 53) (2) Head, pronotum, and elytron bright metallic green (Fig. 17) Head, pronotum, and elytron mostly black or dark metallic blue or green with a few light-green spots (Fig. 25)  Base of elytron with dark-yellow spot lateral to scutellum (Fig. 23). Median lobe of aedeagus narrows substantially from middle to apex in ventral view (Fig. 26)