Pseudocladotoma sp.

Shepard, William D. & Sites, Robert W., 2019, Aquatic Larvae Of Eulichadidae and Ptilodactylidae (Coleoptera: Byrrhoidea) from Thailand, with Description of the Larva of? Pseudocladotoma Pic, The Coleopterists Bulletin 73 (1), pp. 142-148 : 146-147

? Pseudocladotoma sp. larva

Description. Body: Length 7.80 mm, well-

sclerotized, covered with round tubercles, elon-

gate, parallel-sided, cylindrical in cross-section

( Figs. 3 . 4); Color brown; patches of long white

setae laterally on all thoracic and abdominal seg-

ments; light-colored middorsal line from prothorax

to abdominal segment 5; posterior borders of pro-

thorax to abdominal segment 7 dentate, with dense

row of stiff, white setae, setae angled toward

midline; abdominal segment 8 triangular in cross-

section, middorsal ridge stout, armed with short

setae, lateral ridges parallel-sided in basal third, then

pinched toward middle until drawn out into a siphon

with apical patch of long white setae. Head: An-

terior border with 6 projecting lobes, middle 2 lobes Fig. 4. Diagrammatic representation of the ventral on labrum; dorsum covered with round tubercles; sclerites of the thoracic and first three abdominal segments of the larva of? Pseudocladotoma .

stemmata grouped into eyespots, eyespot areas not

well sclerotized, gena with stout ridges. Labrum

very short and wide, with median anterior cleft. projecting from under plate; 3 palpomeres – Clypeus short and wide, with 2 flat, apically truncate antepenultimate palpomere barely visible, penultilateral lobes; clypeofrontal suture indistinct. Frons mate palpomere approximately 5X longer than shorter than broad; laterally with 2 anteriorly di- wide, ultimate palpomere 2X longer than wide and rected, rectangular lobes overlaying antenna; cor- much shorter than previous palpomere. Thorax: onal suture distinct, anteriorly directed and reaching Pro- and mesonota with short, linear areas devoid of lateral edges of lateral lobes. Labium a single large tubercles and situated halfway between midline and flat plate covering entire venter of head. Labial palps lateral margin. Venter with lightly sclerotized cervical

labium, metathorax with a diamond-shaped basisternum, lack of separate sternal sclerites on abdominal segments 4–7 (all sclerites fused to yield a sclerotized ring), and a narrower siphon on abdominal segment 8. It differs from that of Drupeus (see fig. 48 in Lee et al. 2008) by the lack of a probasisternum, lack of intertergites on the meso- and metathoraces, lack of a postcoxale on the pro-, meso-, and metathoraces, presence of pleurites on abdominal segment 3, and having undivided abdominal pleurites. It differs from the larva of Paralichas by the plate-like labium, mesothoracic basisternum in one piece, lack of pleurites on abdominal segments 4–7, and the middorsal line extending only to abdominal segment 5.

Locality. The locality is a mountain stream.

PHRAE Province: Wieng Ko Sai National Park, Namtok Maekung, Tier 1, 2 September 2002, 400 m, 17°58’N 99°35’E, CMU team (1 larva) ( Fig. 5 ) This is a new country record for the genus .

sclerite, sclerite broadly triangular. Prosternal area with 4 sclerites on each side – precoxale wide anteriorly and extending posteriorly between coxae, 3 laterotergites; procoxal cavities open. Meso- and metasternal areas with median basisternum; with lateral precoxale and 4 laterotergites; mesothorax without spiracles; meso- and metacoxal cavities open. All legs heavily tuberculate; coxae conical; trochanters elongate triangular; femora and tibiae elongate, with numerous white setae; tarsunguli stout. Abdomen: Segments 1–3 with rectangular sternite and 2 lateral pleurites, pleurites on segment 3 elongate-triangular. Segments 4–8 lacking pleurites and longitudinal sutures; segment 8 drawn out dorsally into a truncate spiracular siphon and ventrally with ring-like segment 9 partially visible around circular operculum which covers tracheal gills. Spiracles on segments 2–7 and apically on spiracular siphon; small tubercle-free spot on abdominal segment 1 where spiracle might be but no sclerotized ring present as on following segments.

Discussion. This larva of? Pseudocladotoma differs from that of Austrolichas by the plate-like

Figures

Figs. 2–3. 2) Eulichas larva (24.48 mm long) from Mae Pan River in Doi Inthanon National Park, Thailand. The length of this larva is 24.48 mm; 3)?Pseudocladotoma larva (7.80 mm long) from Phrae Province, Wieng Ko Sai National Park, Thailand.

Fig. 5. Collection localities in Thailand of a larva of?Pseudocladotoma and adult and larval Eulichas species.