Trichoptera

Seetapan, Kriengkrai & Prommi, Taeng On, 2022, The larvae of caddisfly species (Insecta, Trichoptera) in northern Thai streams and their relationships to environmental variables, Zootaxa 5222 (4), pp. 301-324 : 304-308

Trichoptera community composition

A total of 2,748 larvae of Trichoptera were collected from the sampled streams in northern Thailand. Fortyone taxa from seven streams were identified from 24 genera and 13 families ( Table 3 ). At the family level, the Hydropsychidae were the most numerous, accounting for 1,487 specimens (54%). The highest number of caddisfly larvae was collected at S5 (570 individuals), while the lowest number was collected at S4 (213 individuals). Marilia sumatrana Ulmer 1951 was the most abundant species collected, with 318 individuals, followed by Chimarra sp. (276 individuals), Cheumatopsyche cf. dubitans Mosely 1942 (272 individuals), and Potamyia phaidra Malicky & Chantaramongkol 1997 (in Malicky 1997) (219 individuals).

Based on the results of the adult caddisfly species in this study, 10 species of hydropsychid larvae could be associated with identifiable adults. The 10 species of hydropsychid larvae comprised 6 genera: Amphipsyche ( A. meridiana Ulmer 1909 ); Cheumatopsyche ( C. copia Malicky & Chantaramongkol 1997 in Malicky 1997, C. tramota Malicky & Chantaramongkol 1997 in Malicky 1997); Hydropsyche ( Hp. camillus Malicky & Chantaramongkol 2000 , Hp. askalaphos Malicky & Chantaramongkol 2000 , Hp. pallipenne Banks 1938 ); Hydromanicus [ Hm. klanklini ( Malicky & Chantaramongkol 1993) and Hm. serubabel Malicky & Chantaramongkol 1993 ]; Potamyia ( P. phaidra ); Pseudoleptonema ( P. supalak Malicky & Chantaramongkol 1998 in Malicky 1998) ( Table 3 ). Among the taxa identified, Hydropsyche pallipenne and H. askalaphos are described here, whereas the other eight species mentioned above have been described ( Peumwarunyoo & Prommi 2013; Prommi 2016; Prommi & Permkam 2015; Prommi et al. 2006a, 2006b, 2006c) and their identities were confirmed by the metamorphotype method in this investigation. The morphological, biological, and ecological characteristics of species described in the larval stage of the fauna of Thailand are discussed below.

Tables

TABLE 3. Larvae of Trichoptera taxa collected in 7 streams in northern Thailand from October 2019 to July 2020. %RA = percentage of total abundance of species among all sites combined.

Taxa/sampling site	Taxon	Number of	Station							%RA
	Abbr.	larvae	S1	S2	S3	S4	S5	S6	S7
Rhyacophilidae
Rhyacophila cf. inaequalis Denning & Schmid 1971	Rhin	10				10				0.36
Glossosomatidae
Agapetus sp.	Agpe	20	1		1	15	2		1	0.73
Philopotamidae
Chimarra cf. akkaorum Chantaramongkol & Malicky 1989	Chak	14	12	2						0.51
Chimarra cf. bimbltona Malicky 1979	Chbi	6					6			0.22
Chimarra cf. khamuorum Chantaramongkol & Malicky 1989	Chkh	8			8					0.29
Chimarra sp.	Chim	276	90	117		18	41	10		10.05
Polycentropodidae
Polyplectropus sp.	Poly	7		7						0.25
Lepidostomatidae
Lepidostoma cf. doligung ( Malicky 1979)	Ledo	30	14			6	10			1.09
Ecnomidae
Ecnomus sp	Ecno	9		1		1	5	1	1	0.33
Dipseudopsidae
Pseudoneureclipsis sp.	Pseu	11		8	3					0.4
Hydropsychidae
Amphipsyche meridiana Ulmer 1909	Amme	27	1	1	1	9	6	9		0.98
Hydropsyche camillus Malicky & Chantaramongkol 2000	Hyca	62	12		20		30			2.26
Hydropsyche pallipenne Banks 1938 *	Hypa	160	12	16	33	18	10	39	32	5.82
Hydropsyche askalaphos Malicky & Chantaramongkol 2000 *	Hyas	80		14	18			12	36	2.91
Hydropsyche sp.	Hydr	101	4	17	12	15		53		3.68
Hydromanicus klanklini ( Malicky & Chantaramongkol 1993)	Hykl	3					3			0.11
Hydromanicus serubabel Malicky & Chantaramongkol 1993	Hyse	10	1				9			0.36
Cheumatopsyche copia Malicky & Chantaramongkol 1997 (in Malicky 1997)	Chco	40					40			1.46
Cheumatopsyche cf. dubitans Mosely 1942	Chdu	272	59	2				89	122	9.9
Cheumatopsyche tramota Malicky & Chantaramongkol 1997 (in Malicky 1997)	Chtr	33	10	6	6		11			1.2

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