Copelatus caelatipennis princeps Young, 1963

Alarie, Yves, Michat, Mariano C., Watanabe, Kohei, Shaverdo, Helena, Wang, Liang-Jong & Watts, Chris H. S., 2022, An outlook on larval morphology of Copelatinae diving beetles with phylogenetic considerations (Coleoptera: Adephaga, Dytiscidae), Zootaxa 5175 (2), pp. 151-205 : 161-168

Copelatus caelatipennis princeps Young, 1963

Source of material. The two larvae studied (one instar II and one instar III) were associated with adults collected at the following locality: USA. Florida, Orlando. Junction International Drive & Hwy 523, 26–28.IX.2016. 28°53.83’N 81°37.92’W; Y. Alarie leg. The identification is firm as C. caelatipennis princeps is the only Copelatus species known from that locality.

Diagnosis (instar III). The third instar of Copelatus c. princeps can easily be distinguished from that of the other species studied in this paper by the following combination of characters: HL = 0.80 mm; L3 <2.00 mm; U <0.40 mm; head capsule rounded to subquadrate, strongly constricted at level of occipital region ( Fig. 17 ), scale-like sculpticels present over frontoclypeus and parietale; anterior margin of frontoclypeus narrowly convex, extending mesally well beyond level of adnasalia ( Fig. 17 ); adnasalia margined with short bluntly rounded and truncated teeth ( Fig. 63 ); MP2/MP1> 1.50; GA/MP1> 1.50; 1.30 <LP2/LP1 <1.90; inner margin of stipes lacking a dorsal linear row of spinulae; profemur with less than 3 PV and 4 AV secondary setae; metafemur with less than 3 AV secondary setae; urogomphus composed of one urogomphomere; U/HW = 0.40; U/LAS = 0.50; Nearctic and Neotropical.

Description, instar II

Body: Measurements and ratios aimed to characterize body shape are shown in Table 4 .

Head: Head capsule rounded to subquadrate, strongly constricted at level of occiput; anterior margin of frontoclypeus narrowly convex, extending well beyond level of adnasalia; adnasalia margined with short bluntly rounded and truncated teeth (see Fig. 63 ); scale-like sculpticels well-developed over frontoclypeus and parietale; HL = 0.58 mm; A/MP = 1.41; MP/LP = 1.85; MP2/MP1 = 1.73; GA/MP1 = 2.00; LP2/LP1 = 1.73; MNL/MNW = 2.72.

Thorax: L3 = 1.05 mm.

Abdomen: LAS = 0.39 mm; LAS subconical, not constricted posteriorly at point of insertion of urogomphi. Urogomphus: U = 0.22 mm, composed of one urogomphomere; U/HW = 0.38; U/LAS = 0.58.

Chaetotaxy: Parietale with 7 temporal spines; position and number of secondary setae on legs are shown in Table 5 .

Description, instar III ( Figs 17–18 , 63 ). As second-instar larva except as follows:

Body: Measurements and ratios aimed to characterize body shape are shown in Table 6.

Head ( Figs 18 , 63 ): HL = 0.81 mm; A/MP = 1.50; MP/LP = 1.98; MP2/MP1 = 1.67; GA/MP1 = 2.00; LP2/LP1 = 1.51; MNL/MNW = 2.58.

Thorax: L3 = 1.58 mm.

Abdomen ( Fig. 18 ): LAS = 0.64 mm; U = 0.34 mm; U/HW = 0.43; U/LAS = 0.52.

Chaetotaxy: Parietale with 10–12 temporal spines; position and number of secondary setae on legs are shown in Table 7 .

Figures

FIGURE 63. Anterior margin of left adnasalia of selected species of Copelatinae; magnification of 500x except CALT drawn at 400x. Species codes as in Table 1.

FIGURES 17–18. Copelatus caelatipennis princeps Young, 1963, instar III: (17) head capsule, dorsal aspect (scale-like microsculptures not represented); (18) abdominal segment VIII, dorsal aspect. Scale bars = 0.2 mm.