Erinaceialtica, Konstantinov & Linzmeier, 2020

Konstantinov, Alexander S. & Linzmeier, Adelita M., 2020, Moss inhabiting flea beetles of the West Indies III: Erinaceialtica, a new genus from Hispaniola (Coleoptera, Chrysomelidae, Galerucinae, Alticini), ZooKeys 955, pp. 113-145 : 113

Erinaceialtica gen. nov. Figs 1 , 2-4 , 5-7 , 8-11 , 12, 13 , 14 , 15-19 , 20, 21 , 22 , 23-27 , 28-33 , 34-40 , 41-43 , 44, 45 , 46, 47 , 48-51 , 52-54 , Map 1

Description.

Body length 2.1-2.81 mm, width (widest point of elytra) 1.19-1.35 mm, height 0.97-1.13. Elytron metallic green, blue, black, or coppery, light metallic green; some parts of elytra yellow to brown. Color of pronotum almost same as elytron: metallic blue, green, or dark brown, in some species pronotum greenish when elytra blueish.

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.

Mesothorax. Scutellum present. Mesothoracic prefragma very short. Mesoventral process about as wide as long. Mesocoxal cavities transverse. Mesosternum without elevated projection in middle.

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 longitudinal 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, 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).

Figures

Figure 1. Erinaceialtica gabbysalazarae sp. nov., dorsal habitus (illustration by Katie Sayers, USNM and SEL scientific illustrator internship program, summer 2019).

Map 1. Distribution of Erinaceialtica species on the island of Hispaniola.

Figure 14. Erinaceialtica janestanleyae sp. nov., dorsal habitus (illustration by Linden Pederson, USNM and SEL scientific illustrator internship program, summer 2019).

Figure 22. Erinaceialtica rickstanleyi sp. nov., dorsal habitus (illustration by Katie Sayers, USNM and SEL scientific illustrator internship program, summer 2019).

Figures 2 - 4. Adult Erinaceialtica gabbysalazarae, male 2 habitus, dorsal view 3 habitus, lateral view 4 habitus, three quarter view.

Figures 5 - 7. Adult Erinaceialtica gabbysalazarae, male 5 habitus, frontal view 6 median lobe of aedeagus, ventral and lateral views 7 metatibia, dorsal view.

Figures 8 - 11. Adult Erinaceialtica gabbysalazarae, female 8 habitus, dorsal view 9 habitus, lateral view 10 hind leg, lateral views 11 head, frontal view.

Figures 12, 13. El Cachote, habitat of Erinaceialtica gabbysalazarae.

Figures 15 - 19. Adult Erinaceialtica janestanleyae, female 15 habitus, dorsal view 16 habitus, lateral view 17 habitus, three quarter view 18 hind tibia, three quarter view 19 habitus, frontal view.

Figures 20, 21. Zapoten, habitat of Erinaceialtica janestanleyae.

Figures 23 - 27. Adult Erinaceialtica rickstanleyi 23 habitus, dorsal view 24 habitus, lateral view 25 habitus, three quarter view 26 median lobe of aedeagus, ventral and lateral views 27 habitus, frontal view.

Figures 28 - 33. Adult Erinaceialtica rickstanleyi, morphological structures 28 middle part of head, ventral view 29 labrum 30 antenna 31 mesotergite 32 meso- and metasternites 33 metatergite.

Figures 34 - 40. Adult Erinaceialtica rickstanleyi, morphological structures 34 metendosternite 35 hind tarsus 36 right elytron 37 hind leg 38 middle leg 39 abdominal ventrites, female 40 last abdominal tergite, female.

Figures 41 - 43. Adult Erinaceialtica rickstanleyi, female genitalia 41 spermatheca 42 vaginal palpi 43 tignum.

Figures 44, 45. Las Abejas, habitat of Erinaceialtica rickstanleyi.

Figures 46, 47. Adult Erinaceialtica rileyi sp. nov. 46 habitus, dorsal view, male 47 habitus, dorsal view, female.

Figures 48 - 51. Adult Erinaceialtica rileyi 48 habitus, three quarter view, male 49 median lobe of aedeagus, ventral and lateral views 50 habitus, frontal view, male 51 habitus, frontal view, female.

Figures 52 - 55. Adult Erinaceialtica thomasi sp. nov. 52 habitus, dorsal view 53 median lobe of aedeagus, ventral and lateral views 54 habitus, three quarter view 55 habitus, frontal view.