Why in the News
A new species of "happy-face spider", Theridion himalayana, has been described from Uttarakhand (Western Himalaya). It resembles Hawaii's famous Theridion grallator. The New Indian Express reported it on 28 April 2026.
Theridion himalayana
Uttarakhand; polymorphic in both sexes; 32 morphs
Comparison
About 8.5% in COI from the Hawaiian T. grallator
Identification
Mainly from the structure of the genital organs (ducts)
Diagram: an original table.
What Is in the Research Paper?
The title of the research paper is "On the discovery of a new polymorphic Happy-Face Spider (Araneae, Theridiidae) from the Western Himalayas, India, with notes on its natural history". According to the abstract, a new species of Theridion has been found in Uttarakhand, which is polymorphic like Hawaii's T. grallator. In both sexes a smiling-face-like pattern appears on the back in different arrangements of red, black and white spots. 32 such morphs were recorded from three locations in the northwestern state of Uttarakhand. Like T. californicum and T. grallator, this species builds its web hanging upside down.
The authors also examined its position in the family tree using the COI marker. A difference of about 8.5% was found from the Hawaiian species, which is a sign of a species that evolved separately in Asia. According to the abstract, despite moderate overall variation, this species appears isolated in the family tree from its Palaearctic and Nearctic congeners. A dichotomous key for India's Theridion species has also been given.
According to the type-specimen records (the description published on Zenodo/GBIF), the female holotype is from an altitude of about 2,207 m in Uttarakhand, is deposited in the ZSI, and the species is said to be known so far only from the type locality. According to the New Indian Express, the species is identified by the structure of the genital organs: the copulatory ducts are long, coiled and projecting forward, and the fertilisation ducts are short, thin and spread upward in a V shape.
Where Does Confusion Arise in the Exam?
"Happy-face" is a common name. The scientific name in the paper is Theridion himalayana, while the World Spider Catalog records it as Theridion himalayanum with a grammatical correction; in exam preparation, remember the form in the original paper and treat this difference as a matter of name spelling. Also, the 8.5% is a difference based only on COI, and the species looks like T. grallator but is genetically distinct.
The Direction of Preparation from Past Questions:
Statement-based questions have appeared in the official General Studies Paper-I of the UPSC Preliminary Examination 2023. So prepare the species, the location and the basis of identification separately. The questions below are original practice, not real PYQs.
Preliminary Examination Style: Practice Questions
1. On the basis of the abstract of the research paper on Theridion himalayana, consider the following statements:
Statement 1: The species is polymorphic in both sexes.
Statement 2: A difference of about 8.5% was found in the COI gene from the Hawaiian T. grallator.
Statement 3: According to the abstract, the species is found only in the Hawaiian Islands.
How many of the above statements are correct?
(a) Only one
(b) Only two
(c) All three
(d) None
See Answer and Reason
Answer: (b) Only two. Statements 1 and 2 are in the abstract. Statement 3 is wrong; this is a species described from Uttarakhand, distinct from Hawaii's T. grallator.
2. According to the abstract, how many morphs of T. himalayana were recorded from three locations in Uttarakhand?
(a) 32
(b) 3
(c) 8
(d) 85
See Answer and Reason
Answer: (a). The abstract states 32 distinct morphs; 8.5% is the gene difference, not the number of morphs.
3. According to the New Indian Express, how is T. himalayana identified?
(a) By the distinctive structure of the genital organs (the shape of the ducts)
(b) Only by the colour of the back
(c) Only by the size of the web
(d) Only by the altitude
See Answer and Reason
Answer: (a). According to the report, the appearance is like T. grallator, but it can be identified as distinct by the structure of the genital organs.
Sources:
- Evolutionary Systematics 10(1): On the discovery of a new polymorphic Happy-Face Spider (Araneae, Theridiidae) from the Western Himalayas, India, 24 April 2026.
- Zenodo: Theridion himalayana sp. nov. (published description).
- World Spider Catalog: Theridion himalayanum.
- New Indian Express: Odia scientists discover new happy-face spider species, 28 April 2026.
- UPSC: Preliminary Examination 2023, question format.
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