Euchomenella kasetsart Unnahachote, Samung et Jaitrong, 2020

Unnahachote, T., Samung, Y. & Jaitrong, W., 2020, A new species of the praying mantis genus Euchomenella Giglio-Tos, 1916 (Mantodea: Deroplatyidae) from Thailand, Far Eastern Entomologist 419, pp. 18-28 : 20-26

Euchomenella kasetsart Unnahachote, Samung et Jaitrong , sp. n.

http://zoobank.org/NomenclaturalActs/ 8DFECD3F-B93E-4CF1-A5D8-8AF779BEF643

Figs 1 , 2 , 3B , 4A , 5C, 5D , 6

TYPE MATERIAL. Holotype – ♂ (THNHM-I-14183, THNHM), Thailand: Nakhon

Pathom Province, Kasetsart University Kamphaeng Saen Campus, 14°02ˈN, 99°58ˈE, 28.V

2018, T. Unnahachote leg. Paratypes: Thailand: same data as for holoytype, 1 ♀ (THNHM-

I-14184, THNHM); same locality, 2.XI 2019, 1 ♂, T. Klombanchong leg. (RBINS,

IG:34.123); same locality, 29.X 2019, 1 ♀, T. Unnahachote leg. (RBINS, IG:34.123).

DESCRIPTION. Male. Head. Wider than long; compound eye large and round, slightly projecting anteriorly, suboval in lateral view; vertex slightly concave; ocelli well developed forming a triangular shape; ocellar tubercle distinct; antennae longer than in female, filiform,

first segment as long as other two segments combined; lower frons transverse, apical margin distinctly convex, and round.

Pronotum. Metazona slender, approximately 3.7 times as long as prozona and slightly shorter than forewing; anterior end of prozona with a pair of small depressions; lateral margin with very small spines, distinct on prozona but indistinct on metazona; supracoxal dilation small but distinct, rounded, dark brown-black at lateral margin under supracoxal sulcus; supracoxal sulcus distinct; medial keel running from supracoxal sulcus to posterior margin of pronotum, with two elevations close to each other at the end of medial keel; in ventral view, a pair of small, yellowish marks on posterior half.

Prothoracic legs. Coxa slender, darkened apically, shorter than metazona and femur,

anteroventral margin with six to eight small spines and one to three tubercle developed between spines; coxal lobe divided, anterior surface clearly smooth; trochanter with distinct black marking in ventral view; femur slender, distal half of anterior margin slightly concave,

anterior margin with a row of tubercles from base to first DS; four DSs, with fourth shortest and third longest, third and second black at base in ventral view, third DS almost black and others black apically; 15 AvS unequal in size and arranged in pattern IIIIIIIIIIIIIII (in left femur of paratype (RBINS), 14 AvS arranged in pattern IIIIIIIIIIIIII); in ventral view, AvS

1–8, 10 and 15 entirely dark (AvS 14 entirely black in holotype but lost on left forefemur of paratype (RBINS), although not deep black on right forefemur); two distinct black patches,

one at middle between first DS and base, the other consisting of eight AvS and anterior half of claw groove; femoral brush area almost black with four PvS all black apically except for second, which is entirely darken; in dorsal view, tibia with 12–13 AvS (11–12 AvS in paratype RBINS), and seven PvS (7–8 PvS in paratype RBINS), with all spines black only at apex; three somewhat distinct black patches in ventral view at proximal part, middle and base of tibial spine; metatarsus black in proximal half and at tip, with rests black apically.

Mesothoracic and metathoracic legs. Slender; middle leg shorter than hind leg, with two or three somewhat distinct bands (right middle leg lost in holotype); femora with hairs, hairs denser on tibiae and metatarsus; tibiae with two tibial spurs; metatarsus longer than other tarsal segments combined.

Forewing and hindwing. Forewing uniformly brown and smoky; costal area semitransparent in basal third, rest hyaline; subcostal area and stigma semi-opaque, with low cell density at anterior margin; hindwing with same coloration and pattern as forewing, but very smoky apically; costal and subcostal area changing from semitransparent to semi opaque from proximal half to distal half; veins brownish, with darker coloration along cross veins, with low cell density at anterior margin.

Abdomen. Eight visible coxosternites; supra-anal plate (tergite 10) transverse, posterior margin round with occasional setae. Cerci simple, cylindrical with 11 segments, 11th conical

( Fig. 2E ); posterior margin of subgenital plate (coxosternite 9) concave with short, robust styli, setae regularly spaced on ventral surface but slightly longer and denser at posterior margin ( Fig. 2D ).

phallomere; B – ventral phallomere; C – right phallomere; D – subgenital plate; E – supraanal plate.

Male genitalia. ( Fig. 2A–C ). Right phallomere: fda elongated with few setae at apex;

pva well sclerotized, short. Ventral phallomere: elongated, twice as long as broad, anterior end distinctly narrow with a round apex, left margin of posterior end slightly sclerotized; bl

rounded. Left phallomere: paa narrowing towards apex, somewhat sclerotized with distal end shaped like a hook; afa not elongated, round without a medial concavity on right surface,

well sclerotized and entirely covered by dense small spines that are only visible under high magnification.

MEASUREMENTS (in mm, values for the paratype in parentheses). Total length 45.4

(45.2); head width 5.1 (4.9); head height 2.5 (2.3); foretibia length 4.7 (4.8); forefemur length

11.2 (11.4); forecoxa length 9.0 (8.9); pronotum length 18.1 (18.1); pronotum width 2.2

(2.2); prozone length 3.8 (3.8); metazone length 14.3 (14.3); middle femur length 9.2 (9.4);

middle tibia length 7.7, broken in holotype (8.5); hind femur length 12.0 (12.3); hind tibia length 11.4 (11.4); forewing length 25.7 (24.8); hindwing length 22.4 (22.0).

Female. Head. Wider than long, compound eye large and round, slightly projecting anteriorly, suboval in lateral view; vertex slightly concave. Ocelli smaller than in male;

ocellar tubercle difficult to recognize; antennae shorter than those of male.

Pronotum. Metazona slender, approximately 4.15–4.26 times as long as prozona;

anterior end of prozona bearing a pair of small depressions; supracoxal dilation dark brownblack at lateral margin under supracoxal sulcus; more distinct small spines present along pronotal margin, very distinct at prozona; medial keel from supracoxal sulcus to posterior margin of pronotum with two elevations close to each other at end of the keel; a pair of small yellowish marks on the posterior half in ventral view.

macrops ; C, D – E. kasetsart sp. n., paratype.

Prothoracic legs. Coxa slender, darkening apically, shorter than metazona and femur,

anteroventral margin with seven to nine small spines of same color as the coxa but white in live specimen, with two to five tubercles developed between spines; coxal lobe divided, with a clearly smooth anterior surface; trochanter with black marking in ventral view (marking indistinct in dried specimens); femur slender, anterior margin in distal half slightly concave with row of tubercles from base to first DS; four DSs, with fourth shortest and third longest,

second and third black at base of the spine in ventral view, third DS almost black at the anterior surface, others black apically; 15 AvS arranged in pattern IIIIIIIIIIIIIII (in left forefemur of paratype RBINS), 14 AvS arranged in pattern IIIIIIIIIIIIII); in ventral view ,

AvS 2, 4, 6, 8, 10 and 15 entirely black, with AvS 14 on left forefemur also black; AvS 1, 3,

5 and 7 almost black (entirely black in paratype THNHM); two distinct black patches present, one in middle between first DS and base, the other consisting of eight AvS and anterior half of claw groove; femoral brush area almost black with four PvS all black apically, second and third equal in length; tibia with 12–13 AvS, with three somewhat distinct black patches at proximal part, middle, and base of tibial spine in ventral view; seven

PvS; all spines black only at tip; metatarsus black in proximal half and at tip, others black apically (almost lost in paratype THNHM).

Mesothoracic and metathoracic legs. Middle leg shorter than hind leg with two or three somewhat distinct bands; femora with hairs; hairs much denser on tibiae and metatarsus;

metatarsus longer than other tarsal segments combined.

Forewing and hindwing. Forewing uniformly brown, short, and opaque, reaching posterior margin of first visible tergite; hindwing completely covered by forewing.

Abdomen. Six visible coxosternites; supra-anal plate (tergite 10) transverse, posterior margin slightly concave with occasional setae; cerci simple, cylindrical with 13 segments,

13th conical.

MEASUREMENTS (in mm, values for the second paratype in parentheses). Total length

69.2 (67.3); head width 7 (6.8); head height 4.4 (4.2); foretibia length 6.6 (6.9); forefemur length 18.1 (18.1); forecoxa length 14.9 (14.9); pronotum length 31.4 (32.1); pronotum width

3.6 (3.6); prozone length 6.1 (6.3); metazone length 25.3 (26.8); middle femur length 14.3

(15.0); middle tibia length 13.4 (13.7); hind femur length 18.1 (18.7); hind tibia length 19.6

(19.8); forewing length 8.9 (9.0).

DIFFERENTIAL DIAGNOSIS. Both sexes of the new species have distinctly smaller body lengths and ratios of MzL/PzL than the other known Euchomenella species: MzL/PzL

4.15–4.26 in the female and 3.76 in the male for Euchomenella kasetsart sp. n., compared with at least 4.9–5.4 for all other Oriental species. In addition, the new species can be distinguished from the two Vietnamese species as follows.

Euchomenella kasetsart sp. n. can be distinguished from E. adwinae (male unknown) by the following characteristics: 1) the second PvS of the forefemur is black apically and equal in length to the third PvS (entirely black and longer than the third PvS in E. adwinae ); 2) the ninth AvS of the foretibia is black apically (entirely black in E. adwinae ); and 3) the ratio of

MzL/PzL is 4.15 –4.25 ( Fig. 3B ) (3.6 in E. adwinae; see Vermeersch, 2018).

Euchomenella kasetsart sp. n. can be distinguished from E. macrops by the following characteristics: 1) the wings are uniformly brown, forewing having sparser cells at the anterior margin and on apical lobe ( Fig. 5C ), hindwing sparser cells on apical lobe ( Fig. 5D )

and a darker field along the cross veins especially on the anal area (in E. macrops wings are not uniformly brown, with denser cells at the anterior margin of the apical lobe of the forewing and hindwing ( Figs 5A, 5B ), and the cross veins on the anal area with a distinctly bright field along the veins in the male); 2) the cerci have 11 distinct segments in the male

( Fig. 2E ) (in E. macrops cerci with 14 distinct segments); 3) both sides of the anterior half of the ventral phallomere are strongly concave and somewhat round ( Fig. 2B ) (in E. macrops they are slightly concave and somewhat sloping); 4) afa is clearly shorter, without a medial concavity on the right surface ( Fig. 4A ) (in E. macrops it is more elongated with a medial concavity on the right surface, Fig. 4B ); 5) the subgenital plate have robust styli and a clearly concave posterior margin ( Fig. 2D ) (in E. macrops the styli are less robust and the posterior margin is usually truncated).

DISTRIBUTION. This species has been known only from the type locality ( Fig. 7 ).

ETYMOLOGY. The specific name is after the type locality, Kasetsart University,

Kasetsart University Kamphaeng Saen Campus, central Thailand.

macrops .

Figures

Fig 5. Male right forewings (A, C) and hindwings (C, D) of Euchomenella spp. A, B – E.

Fig. 1. Euchomenella kasetsart sp. n., dorsal view. A – holotype male; B – paratype female.

Fig. 2. Euchomenella kasetsart sp. n., male genitalia and terminalia, dorsal view. A – left

Fig. 3. Female pronotum of Euchomenella spp. A – E. macrops; B – E. kasetsart sp. n.; C – E. adwinae.

Fig. 4. Phalloid apophysis of Euchomenella spp. A – E. kasetsart sp. n., B – E. macrops.

Fig. 6. Live specimens of Euchomenella kasetsart sp. n., paratype female (RBINS, IG:34.123).

Fig. 7. Distribution of Euchomenella spp. in Thailand. ■ – E. kasetsart sp. n.; ● – E.