Copelatus oblitus Sharp, 1882

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 : 175-177

publication ID

https://doi.org/ 10.11646/zootaxa.5175.2.1

publication LSID

lsid:zoobank.org:pub:C4601ABE-4C6F-48BA-BA24-3339A44DC15C

DOI

https://doi.org/10.5281/zenodo.7003376

persistent identifier

https://treatment.plazi.org/id/3B0087B3-145A-FF9C-FF3A-FAC2FE74442B

treatment provided by

Plazi

scientific name

Copelatus oblitus Sharp, 1882
status

 

Copelatus oblitus Sharp, 1882 View in CoL

Source of material. The five instar II and five instar III larvae studied were reared ex ovo from adults collected at the following locality: Japan. Mantaburu, Yonaguni-cho, Yonaguni-jima Island, Okinawa Prefecture. 24°27’04.1”N 122°57’36.8”E, 13VI.2019; K. Watanabe leg.

Diagnosis (instar III). The third instar of Copelatus oblitus 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 <0.30 mm; head capsule ovate, not constricted at level of occipital region ( Fig. 30 View FIGURES 30–31 ), scale-like sculpticels present over frontoclypeus and parietale; anterior margin of frontoclypeus narrowly convex, extending mesally well below level of adnasalia ( Fig. 30 View FIGURES 30–31 ); adnasalia margined with short bluntly rounded teeth ( Fig. 64 View FIGURE 64 ); 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 two urogomphomeres; U/HW <0.40; U/LAS <0.50; Oriental and Palaearctic.

Description, instar II

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

Head: Head capsule ovate, not constricted at level of occiput; anterior margin of frontoclypeus narrowly convex, extending mesally below level of adnasalia; scale-like sculpticels present over frontoclypeus and parietale; adnasalia margined with short bluntly rounded teeth (see Fig. 64 View FIGURE 64 ); HL = 0.55–0.58 mm; A/MP = 1.39–1.51; MP/LP = 1.70–1.82; MP2/MP1 = 1.67–1.95; GA/MP1 = 1.85–2.32; LP2/LP1 = 1.56–1.89; MNL/MNW = 2.41–2.61.

Thorax: L3 = 1.10–1.13 mm.

Abdomen: LAS = 0.37–0.39 mm; LAS subconical, not constricted posteriorly at point of insertion of urogomphi. Urogomphus: U = 0.17–0.19 mm, composed of two urogomphomeres; U/HW = 0.26–0.29; U/LAS = 0.45–0.51.

Chaetotaxy: Parietale with 3–5 temporal spines; position and number of secondary setae on legs are shown in Table 5 View TABLE 5 .

Description, instar III ( Figs 30–33 View FIGURES 30–31 View FIGURES 32–33 , 64 View FIGURE 64 ). As second-instar larva except as follows:

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

Head ( Figs 30 View FIGURES 30–31 , 64 View FIGURE 64 ): HL = 0.74–0.80 mm; A/MP = 1.50–1.60; MP/LP = 1.65–1.82; MP2/MP1 = 1.44–1.67; GA/MP1 = 1.59–1.83; LP2/LP1 = 1.31–1.47; MNL/MNW = 2.40–2.60.

Thorax ( Figs 32–33 View FIGURES 32–33 ): L3 = 1.57–1.64 mm.

Abdomen ( Fig 31 View FIGURES 30–31 ): LAS = 0.54–0.60 mm; U = 0.20–0.25 mm, U/HW = 0.22–0.27; U/LAS = 0.37–0.47.

Chaetotaxy: Parietale with 3–4 temporal spines; position and number of secondary setae on legs are shown in Figs 32–33 View FIGURES 32–33 and Table 7 View TABLE 7 .

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Dytiscidae

Genus

Copelatus

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