Triballus semen Lewis, 1884: 137 [Japan: Honshû].
Anapleus semen: Nakane, 1964: 68; Mazur, 1984: 117.
Anapleus japonicus Nakane, 1961: 4 [Rausu, Hokkaidô]; Kryzhanovskij and Reichardt, 1976: 262; Olexa, 1982: 44.
Japanese name: Tsubu-emma-mushi.
Anapleus semen: Ôhara, 1994, 153.
Allied to Triballus americanus, but more convex, with the forehead behind the eyes more elevated, the elytra strigose-punctate at the sides, and the margin simple, not reflexed.
I have only one specimen; it was taken in an old tree at Kiga, near Miyanoshita, May 1880. "
Very shortly ovate or subcircular in outline, moderately convex and a little shining. Head very closely punctured and the punctuation especially dense in front, the frons somewhat depressed medially and weakly raised above antennal insertion on each side, the eyes quite lateral and not prominent. Antennae of moderate length, the scape long and unilaterally swollen, the 1st joint of the funicle about half as long as the scape, as long as 4 following together, the 2nd to 7th short and transverse, and the club dilated and oval. Pronotum strongly narrowed from base to apex, the front margin plainly emarginate, the sides sublinear, only slightly arched on apical third, with both angles rather acute, the basal margin fully twice as broad as the front, linear on each side and obtusely angulate in front of the scutellum, which is very small and triangular, the disc punctured like the head but the punctuation less close on the median and basal areas, with a small oblong impunctate space in front of the scutellum. Elytra more coarsely punctured than the pronotum and the punctures longitudinally confluent forming wrinkles except those near the suture, which is slightly raised, the lateral margins costate but rather obsolete anteriorly, the subhumeral costa distinct, abbreviated in front and behind. Propygidium closely, pygidium less closely punctured. Prosternum with the inner striae only slightly convergent forwards and the outer divergent in front. Pectoral plates more or less closely punctured, the punctures on mesepimera very large, those on sides of metathorax and 1st abdominal sternite also coarse. Abdomen with the 1st sternite large, bearing slightly diverging coxal lines and the rest very short and finely punctured. Fore femora broad, fore tibiae also dilated, falciform, those of four hinder legs slender, tarsi simple and narrow. Body length: 2.3 mm.
In appearance closely allied to A. raddei Reitter, but the body is much larger and black in colour."
Redescription (Ohara, 1994).
Body oval, moderately convex, black and shining; tarsi and antennae rufopiceous. Body length, PPL, 2.05 - 2.23 mm (2.14 ± 0.03, n=5), PEL, 1.95 - 2.11 mm (2.03 ± 0.03, n=5). Width, 1.46 - 1.85 mm (1.67 ± 0.05, n=6). Biometric data are given in Table 24.
Head (Fig. 81C) densely, coarsely and deeply punctate. Epistoma convex. Front depressed between eyes, without stria.
Pronotal sides (Fig. 81A) strongly convergent to apices. Disk of pronotum densely covered with punctures, which are as large as those of head and are separated by their own diameter to half the diameter, and with two shallow depressions behind eyes. Marginal stria strongly carinate and complete, the anterior portion densely crenate.
Epipleural marginal stria complete and densely crenate. Elytral marginal stria somewhat carinate, complete and sparsely crenate, its apical end extending along the apex of elytra and attaining to near the suture. There is a narrow impunctate band outside the epipleural marginal stria. Area between epipleural and elytral marginal striae with two or three rows of coarse punctures. Lateral side of elytra elevated. Surface of elytra (Fig. 82A, B) densely covered with coarse punctures, which are a little larger than those of pronotum and are separated by one-third to half their diameter; fine punctures narrowly along suture; basal half of elytra densely with longitudinal rugae; extreme apex impunctate. Dorsal stria absent.
Propygidium densely covered with somewhat deep punctures, which are a little finer than the elytral ones and separated by about half their diameter. Pygidium (Fig. 82D) sparsely punctate, the punctures being separated by their diameter and as large as those of propygidium.
Anterior margin of prosternal lobe (Fig. 82C) straight medially and slightly marginate and carinate; sides strongly carinate and marginate; basal angles deeply excavate, the excavations are situated just before ends of carinal striae of prosternal process. Disks of the lobe and the process densely covered with coarse, deep punctures and sometimes intermingled with ocelloid ones, these coarse punctures being separated by about half their diameter and becoming sparser on a narrow basal band. Carinal striae completely impressed.
Anterior margin of mesosternum (Fig. 82C) nearly straight; disk of mesosternum short (width : length = 4 : 1), and coarsely and sparsely covered with ocelloid and shallow punctures, which become finer medially; lateral side completely marginate. Meso-metasternal suture complete and strongly carinate. Mesosternum feebly convex on median area, and covered with deep, round and large punctures, which are separated by about half their diameter, the punctures becoming sparser on median area. Lateral metasternal stria extending obliquely and posteriorly, reaching near middle of metasternal-metepisternal suture. Intercoxal disk of 1st abdominal sternum densely covered with punctures, which are a little finer than those of the metasternum, longitudinal oblong, and separated by one-third their diameter laterally, and become finer and sparser on the median area; its sides completely striate and strongly carinate.
Protibia dilated, its outer margin angulate about middle.
Male genitalia as shown in Fig. 83.
Table 24. Biometric data for Anapleus semen Lewis
| Holotype | Holotype of A.japonicus | male and female | |
| APW | 0.43 | 0.63 | 0.43-0.63 (0.58±0.03) 6 |
| PPW | 1.14 | 1.40 | 1.14-1.42 (1.33±0.04) 6 |
| PL | 0.51 | 0.59 | 0.51-0.67 (0.59±0.02) 6 |
| EL | 1.26 | 1.48 | 1.26-1.48 (1.40±0.03) 6 |
| EW | 1.46 | 1.69 | 1.46-1.85 (1.67±0.05) 6 |
| ProW | 0.67 | 0.79 | 0.67-0.79 (0.75±0.02) 6 |
| ProL | 0.20 | 0.22 | 0.20-0.28 (0.23±0.01) 6 |
| PyL | 0.45 | 0.39-0.45 (0.42±0.01) 5 | |
| PTL | 0.61 | 0.53-0.67 (0.61±0.02) 5 | |
| MSTL | 0.69 | 0.59-0.69 (0.63±0.02) 5 | |
| MTTL | 0.75 | 0.65-0.75 (0.70±0.02) 5 |
Remarks. Anapleus semen is a relatively large species; it is similar to A. nakanei and A. nomurai; however, the rather larger body and the dense punctation on the elytra will distinguished it from them.
This species is found on logs.
Specimens examined (Ohara, 1994).
Holotype of Triballus semen Lewis, 1884, labelled "Type", "Miyanoshita, Japan, 1880" and "Triballus semen Lewis" (The Natural History Museum, London).
Holotype of Anapleus japonicus Nakane, labelled "Holotype", "Rausu, Shiretoko, (Hokkaidô,) 8/vii/1958, T. Nakane leg." and "Anapleus japonicus, Det. T. Nakane, 1961" (Nakane collection).
[Hokkaidô] 1Åâ1Åä, Hôheikyô, Jôzankei, 16/vii/1988, M. Ôhara leg.
[Honshû] <Tochigi-ken> 1 ex., Nikkô, 11-13/vi/1967, H. Takizawa leg. <Tôkyô-to> 1 ex., Takao-san, 27/vi/1970, H. Takizawa leg.
Specimens examined [additional records]. (Ohara, 1999a).
[Hokkaido] Proper: Nakayama-fûketu, PT7 (1 ex., 23/vi8/vii/1994; 1 ex., 418/viii/1994; 1 ex., 8-20/vii/1994; HOR), S. Hori; Chimikeppu-ko, Tubetsu-chô, PTB1 (1 ex., 22/vi-6/vii; 2 exs., 19/vii-3/viii/1994; HOR), S. Hori; Nokanan, Ashibetu (1 ex., 28/v-11/vi/1995, SA), K. Sasaki; Honryû, Shimukappu (1 ex., 24/vi/1995, SA), K. Sasaki; E'chû-dantai, Minami-furano (1 ex., 10-24/vi/1994), K. Sasaki; Kitaochiai, Minami-furano (1 ex., 27/v-10/vi, SA; 2 exs., 10-24/vi/1994, SEHU), K. Sasaki; Fushimisenkyô, near Bisei-damu, Memuro, (1 ex., 17/vi/1995, KIT), K. Ito.